EP2031754B1 - Convertisseur de fréquence pour le renforcement de fréquence intermédiaire d'un appareil radio - Google Patents

Convertisseur de fréquence pour le renforcement de fréquence intermédiaire d'un appareil radio Download PDF

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Publication number
EP2031754B1
EP2031754B1 EP08105099A EP08105099A EP2031754B1 EP 2031754 B1 EP2031754 B1 EP 2031754B1 EP 08105099 A EP08105099 A EP 08105099A EP 08105099 A EP08105099 A EP 08105099A EP 2031754 B1 EP2031754 B1 EP 2031754B1
Authority
EP
European Patent Office
Prior art keywords
switch
controlled oscillator
quartz
frequency
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP08105099A
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German (de)
English (en)
Other versions
EP2031754A3 (fr
EP2031754A2 (fr
Inventor
Oliver Baier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Loewe Opta GmbH
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Loewe Opta GmbH
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Filing date
Publication date
Application filed by Loewe Opta GmbH filed Critical Loewe Opta GmbH
Publication of EP2031754A2 publication Critical patent/EP2031754A2/fr
Publication of EP2031754A3 publication Critical patent/EP2031754A3/fr
Application granted granted Critical
Publication of EP2031754B1 publication Critical patent/EP2031754B1/fr
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H03D3/24—Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits
    • H03D3/241—Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits the oscillator being part of a phase locked loop
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop

Definitions

  • the invention relates to a frequency converter for the intermediate frequency amplifier of a radio.
  • Today's intermediate frequency amplifiers of radios contain processors with integrated frequency converters, which serve to convert the frequency of an input signal into a lower-frequency output signal.
  • Such intermediate frequency amplifiers are used, for example, in the conversion of DVB signals from an input frequency to an output frequency which is more suitable for further processing, for example from 36 MHz signals into 6 MHz signals.
  • Such intermediate frequency amplifiers can also be used for frequency conversion of audio intermediate frequency signals, for example from 33.3 MHz signals to 10.7 MHz signals.
  • This frequency converter 1 has an input E1, to which a first intermediate frequency signal is applied. This passes through a preamplifier 2 and then passes to a mixer 3. The required for frequency conversion of the signal mixing signal is provided by a PLL 4, which is connected to a first quartz 5. The output signal of the mixer 3 is passed through a filter 6 to an output A1 of the frequency converter.
  • the signal provided at the output A1 has a qualitative deterioration due to the mixing process in terms of phase noise and jitter. This qualitative deterioration manifests itself in a comparatively low C / N or S / N ratio, which can cause problems in sequential circuits. This qualitative degradation is mainly caused by the PLL that provides the composite signal.
  • the basic structure of such a PLL is in the FIG. 2 shown.
  • the illustrated PLL 4 is connected to a first quartz 5, which is connected to a quartz-controlled oscillator 7 of the PLL.
  • the output signal of the quartz-controlled oscillator 7 is forwarded via a first frequency divider 8 to an input of a phase comparator 9.
  • the other input of the phase comparator 9, the guided over a second frequency divider 11 output of a voltage controlled oscillator 10 is supplied.
  • the output signal of the phase comparator 9 is fed via a loop filter 12 to the voltage-controlled oscillator 10 in order to readjust it.
  • the output signal of the voltage-controlled oscillator 10 is further forwarded to a mixed signal output 13 of the PLL 4 and from there as a mixed signal to the in the FIG. 1 shown mixer 3 passed.
  • the provided mixing signal can be varied in steps corresponding to a multiple of the reference frequency.
  • the reference frequency is the quotient of the quartz frequency and the division factor R of the first frequency divider 8.
  • the aim of such a PLL is to make the user a variety of different mixing frequencies accessible. While the signal provided by the crystal controlled oscillator 7 is low noise and jitter poor, due to the structure of the voltage controlled oscillator and the in the PLL, the mixed signal provided by the PLL degrades in terms of these characteristics.
  • a device for the reception of broadcast signals which is provided for receiving at least one digitally transmitted radio signal and for receiving at least one analog or analog and digital mixed transmitted broadcast signal.
  • To convert the at least one analog transmitted broadcast signal to an intermediate frequency signals are used, which are output from receiver components such as the signal source of the local oscillator signal, which are provided for frequency conversion of the at least one digitally transmitted radio signal.
  • frequency conversion of the received signal is performed by using the output of a voltage controlled oscillator connected to a phase locked loop, respectively.
  • the output signal of the voltage-controlled oscillator is fed to the respective mixer either directly or via a frequency divider.
  • a frequency conversion using the output signal of a reference oscillator is performed such that the signal received in the AM band is converted into the FM band.
  • From the DE 11 05 921 A is a frequency-stable, multi-channel FM superimposed receiver with at least two different intermediate frequencies.
  • the superposition frequency of the first mixing stage is generated as the sum or difference of two auxiliary frequencies, one of which is quartz-stabilized and the other is variable.
  • the average frequency and the frequency range of the variable auxiliary frequency of the first local oscillator vote numerically about the average frequency and the frequency range of the second local oscillator match.
  • the quartz-stabilized auxiliary frequency, the variable auxiliary frequency of the first local oscillator and the frequency of the second local oscillator are selected to satisfy a predetermined relationship.
  • Various quartz crystals can be connected to the quartz-stabilized local oscillator using a switch.
  • a PLL that includes a crystal oscillator and a voltage controlled oscillator.
  • the output signals of the quartz oscillator and the voltage controlled oscillator are compared in a phase comparator.
  • the output signal of the phase comparator is fed back via a charge pump and a low-pass filter for readjustment to the voltage-controlled oscillator.
  • a spread-spectrum demodulating apparatus has a mixer which is connected to an antenna and is supplied with a mixed signal generated by a pseudo noise generator.
  • the known device includes a PLL having a voltage controlled oscillator, a phase comparator and a loop filter. The output of the loop filter is used as a control signal for a switch via a level discriminator and a control signal generator. In a first switching position of this switch, an oscillator is connected to the input of the pseudo noise generator. In the second switching position of this switch, an input signal provided at an input BIn is connected to the input of the pseudo noise generator.
  • the object of the invention is to provide a frequency converter, which does not have the disadvantages described above.
  • the advantages of the invention are, in particular, that the user can still access the high frequency variance, which is based on the use of a PLL, but on the other hand also has the option of applying high quality requirements to the mixed signal on the other hand to access the high quality output of the crystal controlled oscillator.
  • FIG. 3 shows a block diagram of a PLL according to a first embodiment of the invention.
  • the in the FIG. 3 PLL shown can instead of in the FIG. 2 shown PLL as PLL 4 of in the FIG. 1 shown frequency converter can be used.
  • the in the FIG. 3 PLL 4 shown is as well as in the FIG. 2 shown PLL connected to a first quartz 5, which is connected to a crystal controlled oscillator 7 of the PLL.
  • the output signal of the quartz-controlled oscillator 7 is forwarded via a first frequency divider 8 to an input of a phase comparator 9.
  • the other input of the phase comparator 9, the guided over a second frequency divider output of a voltage controlled oscillator 10 is supplied.
  • the output signal of the phase comparator 9 is fed via a loop filter 12 to the voltage-controlled oscillator 10 in order to readjust it.
  • the output signal of the voltage-controlled oscillator 10 is conducted from the output of the voltage-controlled oscillator 10 to a contact a of a first switch 14.
  • the output signal of the quartz-controlled oscillator 7 is passed from the output of the quartz-controlled oscillator 7 to a contact b of the first switch 14.
  • the contact c of the first switch 14 is connected to the mixed signal output 13 of the PLL.
  • the switch 14 is located in its switch position b, then the output signal of the quartz-controlled oscillator 7 is provided at the mixed signal output 13 of the PLL 4.
  • the first switch 14 is controlled by means of a first switch control signal, which is provided to the PLL at a first control input 15.
  • This switch control signal is transmitted for example via a bus connected to the intermediate frequency amplifier and then fed to the first control input 15.
  • a quartz is used in this embodiment, which delivers signals with the mixing signal frequency required at the mixed signal output 13.
  • a frequency divider can be used by means of which the frequency signals provided by the quartz 5 are converted into signals having the required mixed signal frequency.
  • the user consequently has the option of either accessing the high frequency variance of the PLL or, in the case of applications which place high qualitative demands on the mixed signal, accessing the high-quality signal of the crystal-controlled oscillator 7.
  • FIG. 4 shows a block diagram of a PLL according to a second embodiment of the invention.
  • the in the FIG. 4 PLL shown can instead of in the FIG. 2 shown PLL as PLL 4 of in the FIG. 1 shown frequency converter can be used.
  • the in the FIG. 4 shown arrangement differs from that in the FIG. 3 shown arrangement in that the first quartz 5 is connected via a second switch 16 to the crystal-controlled oscillator 7. If this second switch 16 is in its switch position a, then the first quartz 5 is connected to the quartz-controlled oscillator 7. By contrast, if the second switch 16 is in its switch position b, then the quartz-controlled oscillator 7 is connected to a second quartz 18.
  • the control of the second switch 16 is effected by means of a second switch control signal, which is provided to the PLL via a second control input 17.
  • This second switch control signal is transmitted for example via a bus connected to the intermediate frequency amplifier and then fed to the second control input 17.
  • This additional choice of two or even more quartz it is possible to optimize the intermediate frequency amplifier not only in terms of analog broadcasting or digital broadcasting signals, but to adjust as needed. For example, when receiving FM radio signals, with a frequency conversion from the 33.3 MHz area to the 10.7 MHz area, and when receiving terrestrial digital Television signals, with a frequency conversion of the 36 MHz range in the 6 MHz range, each using its own quartz. Furthermore, a continuous mixing operation between use of the PLL and use of a low-noise crystal controlled oscillator is possible.
  • the first switch 14 in its switch position a, so that there is PLL operation.
  • the first switch 14 In the presence of terrestrially received television signals, the first switch 14 is in its switch position b and the second switch 16 is also in its switch position b, so that the second quartz 18 is accessed.
  • the first switch 14 In the presence of FM radio signals, the first switch 14 is also in its switch position b, the second switch 16 but in its switch position a, so that the first quartz 5 is accessed.
  • Position of the switch 14 Position of the switch 16 PLL for analog and digital analog (low noise) digital (low noise) a a Step size A - - a b Step size B - - b a - 33.3 MHz ⁇ 10.7 MHz - b b - - 36 MHz ⁇ 6 MHz

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Superheterodyne Receivers (AREA)

Claims (11)

  1. Convertisseur de fréquence pour l'amplificateur de fréquence intermédiaire d'un récepteur radio avec
    - un mélangeur (3), une PLL (4) branchée au mélangeur et un premier quartz (5) branché à la PLL,
    pour lesquels
    - la PLL (4) possède un oscillateur (7) commandé par le premier quartz (5), un oscillateur commandé en tension (10), un comparateur de phase (9) et une sortie de signal mixte (13) reliée au mélangeur (3),
    - la sortie de l'oscillateur (7) commandé par le premier quartz (5) est branchée à une première entrée du comparateur de phase (9) par un premier diviseur de fréquence (8),
    - la sortie de l'oscillateur commandé en tension (10) est branchée à une seconde entrée du comparateur de phase (9) par un deuxième diviseur de fréquence (11),
    - le signal de sortie du comparateur de phase (9) est conduit à l'oscillateur commandé en tension (10) par un filtre de boucle (12) afin de réguler l'oscillateur, caractérisé en ce que
    - entre l'oscillateur commandé en tension (10) et la sortie du signal mixte (13) de la PLL, un premier interrupteur (14) est prévu. Sur sa première position de commutation (a), la sortie de l'oscillateur commandé en tension (10) est connectée avec la sortie du signal mixte (13) et sur sa seconde position de commutation (b), la sortie de l'oscillateur commandé par le quartz (7) est connectée avec la sortie de signal mixte (13).
  2. Convertisseur de fréquence selon la revendication 1 caractérisé en ce qu'il possède une première entrée de commande (15) grâce auquel un premier signal de commande de l'interrupteur est conduit au premier interrupteur (14).
  3. Convertisseur de fréquence selon la revendication 2 caractérisé en ce qu'il est branché à un bus de données et que le premier signal de commande de l'interrupteur est conduit à la première entrée de commande (15) par le bus de données.
  4. Convertisseur de fréquence selon l'une des revendications précédentes, caractérisé en ce que dans la seconde position de commutation (b) du premier interrupteur (14), l'oscillateur commandé en tension (10) est désactivé.
  5. Convertisseur de fréquence selon l'une des revendications précédentes caractérisé en ce que l'oscillateur commandé par quartz (7) est branché au premier quartz (5) par un second interrupteur (16) et relié dans une première position de commutation (a) du second interrupteur de l'oscillateur commandé par quartz (7) avec le premier quartz (5) et dans une seconde position de commutation (b) du second interrupteur de l'oscillateur commandé par quartz (7) avec un second quartz (18).
  6. Convertisseur de fréquence selon la revendication 5 caractérisé en ce qu'il possède une deuxième entrée de commande (17) par laquelle un second signal de commande de l'interrupteur est conduit au second interrupteur (16).
  7. Convertisseur de fréquence selon la revendication 6 caractérisé en ce que le second signal de commande de l'interrupteur est conduit à la seconde entrée de commande (17) par le bus de données.
  8. Convertisseur de fréquence selon l'une des revendications 5-7 caractérisé en ce que le premier interrupteur (14) se trouve lors de la réception de signaux TV numériques par câble dans sa première position de commutation (a) et lors de la réception de signaux TV numériques transmis par voie terrestre dans sa seconde position de commutation (b).
  9. Convertisseur de fréquence selon la revendication 8 caractérisé en ce que le second interrupteur (16) se trouve lors de la réception de signaux TV numériques transmis par voie terrestre dans sa seconde position de commutation (b).
  10. Convertisseur de fréquence selon l'une des revendications 5-9 caractérisé en ce que lors de la réception de signaux radio audio FM le premier interrupteur (14) se trouve dans sa seconde position de commutation (b) et le second interrupteur (16) se trouve dans sa première position de commutation (a).
  11. Convertisseur de fréquence selon l'une des revendications 5-7 caractérisé en ce que dans la première position de commutation (a) du premier interrupteur (14), lorsque l'oscillateur commandé en tension (10) est activé, le second interrupteur (16) est commuté entre les deux positions de commutation (a et b) sans arrêt.
EP08105099A 2007-08-31 2008-08-22 Convertisseur de fréquence pour le renforcement de fréquence intermédiaire d'un appareil radio Not-in-force EP2031754B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007041283 2007-08-31

Publications (3)

Publication Number Publication Date
EP2031754A2 EP2031754A2 (fr) 2009-03-04
EP2031754A3 EP2031754A3 (fr) 2010-11-10
EP2031754B1 true EP2031754B1 (fr) 2011-08-03

Family

ID=40032723

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08105099A Not-in-force EP2031754B1 (fr) 2007-08-31 2008-08-22 Convertisseur de fréquence pour le renforcement de fréquence intermédiaire d'un appareil radio

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EP (1) EP2031754B1 (fr)
AT (1) ATE519271T1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1105921B (de) 1960-01-14 1961-05-04 Sueddeutsche Telefon App Kabel Frequenzstabiler Vielkanal-UKW-UEberlagerungsempfaenger
DE69433080T2 (de) * 1993-11-19 2004-06-03 Victor Company of Japan, Ltd., Yokohama Zwischen FSK und PSK umschaltbare Spreizspektrumübertragung
DE102004020551A1 (de) 2004-04-27 2005-11-17 Robert Bosch Gmbh Vorrichtung für den Empfang von Rundfunksignalen
JP2007189455A (ja) * 2006-01-12 2007-07-26 Thine Electronics Inc 位相比較回路およびそれを用いたｐｌｌ周波数シンセサイザ

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EP2031754A3 (fr) 2010-11-10
ATE519271T1 (de) 2011-08-15
EP2031754A2 (fr) 2009-03-04

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